/* CSS 注释 */
body {
    background: #e4e8e9;
    background: linear-gradient(#46a08c, #216faa);
  }
h1 {
    text-align: center;
    font-weight:500;
    font-size: 3em;
    font-family: '黑体';
    /* letter-spacing: -10px; */
    /* text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 40px #ff00de, 0 0 70px #ff00de; */
    /* background: linear-gradient(#648880, #293f50); */
  
  
  }
  li {
    color: red;
  }
  /* 文字相关属性 */
  body {
    font-family: "SF Pro SC","SF Pro Text","SF Pro Icons","PingFang SC","Helvetica Neue","Helvetica","Arial",sans-serif;
    font-size: 1em;
    line-height: 1.5;
    /* background-image: url('https://cn.bing.com/th?id=OHR.VeniceBeach_ZH-CN9971532384_1920x1080.jpg&rf=LaDigue_1920x1080.jpg'); */
  }
  p {
    text-indent: 2em;
  }
  #box {
    text-align: center;
    border: 4px solid blue ;
  }
  .box-model {
    border: 10px solid red ;
    height: 100px;
    width: 100px;
    /* margin-top: 10em;
    margin-left: 10em; */
    margin: 10em;
    padding: 1em;
  }
  